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separation processes

The goal is to separate methanol from water using distillation. We have a 50-50 feed input as a two-phase mixture with 50% vaporized coming in at 500 kmol/hr. The column is well insulated and has a total condenser. A reflux is set to 2 and returned as saturated liquid. The composition in the distillate and bottoms are to be 0.95 and 0.05 mole fractions, respectively. The column is at 1 atm. If 100 kmol/hr were taken off as saturated liquid somewhere in the column such the composition is 0.75 mole fraction methanol, what is the optimal stage for this? How many stages are there?

VLE data for methanol water mixture

 

x

 

 

y

 

0.01

0.10

 

0.03

 

0.23

0.07

0.39

0.14

0.57

0.24

0.68

0.48

0.79

0.57

0.82

0.74

0.91


university   Chemical-Engineering   
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